Replace is_synthetic bit on Fields with is_reflectable. Mark private fields of dart:* as non-reflec…

Replace is_synthetic bit on Fields with is_reflectable. Mark private fields of dart:* as non-reflectable.

This fixes an inconsistency in mirrors where some classes in dart:* would claim to have a field but throw NSM if one attempts to access it, and prevents accessing private static fields of dart:* that don't have implicit getters or setters.

R=asiva@google.com

Committed: https://github.com/dart-lang/sdk/commit/b34267d0d79d43bc343a26901f67a00a176f4bb8

[rmacnak, 2015-08-06 17:10:03]

rmacnak@google.com changed reviewers:
+ asiva@google.com

[siva, 2015-08-06 18:05:47]

lgtm

[rmacnak, 2015-08-06 23:48:06]

Committed patchset #1 (id:1) manually as
b34267d0d79d43bc343a26901f67a00a176f4bb8 (presubmit successful).